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Vibrational Spectra of Controlled‐Structure Hydroxyapatite Coatings Obtained by the Polymeric Route
Author(s) -
Bertoluzza A.,
Bottura G.,
Taddei P.,
Tinti A.,
Morelli M. A.
Publication year - 1996
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199610)27:10<759::aid-jrs36>3.0.co;2-f
Subject(s) - bioceramic , octacalcium phosphate , amorphous solid , raman spectroscopy , amorphous calcium phosphate , coating , stoichiometry , materials science , ion , chemical engineering , calcium , phosphate , layer (electronics) , molar ratio , chemistry , crystallography , composite material , organic chemistry , metallurgy , catalysis , physics , optics , engineering
This work illustrates the role of HPO 4 2− ions, contained in the major precursors of hydroxyapatite (HAP), in both the in vitro and in vivo formation of HAP. In fact this ion, through strong OHO H‐bonding, can stabilize the structure of the different calcium phosphates (amorphous tricalcium phosphate, amorphous and crystalline octacalcium phosphate, non‐stoichiometric apatites, etc.) involved in the processes of HAP formation. Therefore, the planning of bioceramic coatings which induce the osteogenesis process should be aimed at obtaining HAP surfaces containing HPO 4 2− ions with variable and determinate PO 4 3− /HPO 4 2− molar ratios. On the basis of vibrational spectroscopic results, this work indicates that instead of the plasma flame spray (PFS) method, which induces deep modifications of composition and structure of the coating, the polymeric route wet‐way method coupled with a surface treatment similar to that used in dentistry for the ‘smear layer’ is able to yield a surface containing HAP and also HPO 4 2− ions.